ABSTRACT
This chapter focuses on the environmental impact of street trees considering different urban morphologies and their implications in relatively dense cities. The compact city design presents new challenges with respect to street tree plantings, such as wind speed reduction at the pedestrian level and increased exposure to air pollution. The cooling effect is also limited in instances where the heights of buildings largely exceed those of trees in the same vicinity, thus contributing dominantly to the radiation processes. Therefore, innovative synergistic design strategies for both buildings and tree planting, and implementation of green infrastructure are urgently required to optimise the benefits from street trees and develop more sustainable and healthier future cities.
